TL;DR
Dried toothpaste is not a stain, it is a hardened deposit sitting on top of the surface, and the only safe way to remove it is to soften it before touching it. Lay a warm damp cloth over the spot for two to five minutes, then lift it with a soft plastic edge or a fingernail. Never scrape a countertop with metal, and never use an abrasive powder on quartz or natural stone.
Why toothpaste dries so hard
Toothpaste is mostly water plus mild abrasives, thickeners, humectants, and binders. When the water evaporates, what is left behind is a compacted mineral-and-polymer solid.
That solid grips the surface it dried on, particularly on anything with texture. On a mirror it goes cloudy and film-like. On a matte or textured countertop it locks into every microscopic pit.
Whitening formulas often contain more abrasive material and dry harder still. Gels behave a little differently but end up in the same place.
The mistake almost everyone makes is attacking it dry, either with a scrubbing pad or with a fingernail, on a surface that scratches. Toothpaste is harmless. The scratch is permanent.
How do you remove dried toothpaste from a countertop?
Lay a warm damp cloth over the spot and leave it two to five minutes so the deposit rehydrates and softens, then wipe it away with the cloth. For anything that resists, lift the edge with a soft plastic scraper or a fingernail, re-wet, and wipe again.
The safe removal method
1. Wet it and wait. A warm damp cloth laid directly over the spot. Two minutes for a thin film, five or more for a thick blob. Re-wet it if it dries out.
2. Wipe with the cloth. Most of it will come away with no pressure at all. This alone handles the majority of cases.
3. If it resists, soften it again. Longer, not harder. Patience beats pressure on every surface in a bathroom.
4. Lift the edge with something soft. A plastic card, a silicone spatula edge, or a fingernail, working under the deposit at a shallow angle rather than scraping across the surface.
5. Add a drop of dish soap for greasy residue. Splatter often lands mixed with soap film and skin oil.
6. Wipe with clean water and dry with a soft cloth. Drying prevents water spots.
Never use a razor blade, a metal scraper, a knife, or a steel wool pad on a vanity top. Never use a scouring powder without knowing the surface first.
What is safe on your particular vanity top
This is the part that matters, because the wrong product does permanent damage.
Quartz, meaning engineered stone. It is resin-bound. No bleach, no abrasives, no scouring pads, no high heat. Warm water, mild dish soap, and a soft cloth. Never use anything with a high or low pH on it. Softening and wiping is the correct approach.
Marble, travertine, and limestone. Acid-sensitive. Vinegar, lemon juice, and acidic bathroom cleaners permanently etch them, leaving dull patches that cannot be polished out at home. Use only a pH-neutral cleaner. No abrasives.
Granite. Sealed stone. Acids and abrasives degrade the sealer, which then lets stains soak in. pH-neutral cleaner and a soft cloth.
Cultured marble and solid surface. A resin material with a gel coat on top. It scratches and dulls with abrasives, so use a non-abrasive cleaner only.
Laminate. Reasonably tough but abrasives leave a dull patch, and standing water at the seams causes swelling. Wipe and dry.
Ceramic tile. Tolerates most cleaners, but the grout between tiles is porous and stains. Oxygen bleach is safer on grout than chlorine bleach, and sealing grout is the real fix.
Porcelain and enameled sinks. Durable, but abrasives dull the glaze over years. A non-scratch pad is the most aggressive thing worth using.
If you do not know what your counter is, treat it as the most delicate possibility on this list: warm water, mild soap, soft cloth, and patience.
Why does toothpaste leave a white film on a mirror?
The white haze is dried toothpaste plus the mineral residue left when hard water evaporates around it. Wipe the spots away with a warm damp cloth first, then clean the whole mirror with a glass cleaner or a mild vinegar solution on a microfiber cloth, drying with a second dry cloth.
Mirrors, faucets, and the toothbrush holder
Mirrors. Deal with the spots individually with a damp cloth, then clean the whole surface. A mild vinegar solution -- one part white vinegar to four parts water -- works well on glass. Do not let it run down onto a stone counter below.
Faucets and fixtures. Chrome and brushed nickel scratch. Softening and wiping only, then dry them to prevent water spots.
Around the sink drain. Toothpaste combines with soap scum here into a hard ring. A soft brush and warm soapy water handles it.
The toothbrush holder. This is where most of the toothpaste actually ends up, described in how to clean a slimy toothbrush holder.
An electric toothbrush base. Toothpaste and water run down the handle onto the charger, which needs a different approach again -- see how to clean an electric toothbrush base.
The tube itself, and preventing splatter
A crusty tube cap is the same deposit. Soak the cap in warm water for a few minutes and wipe the threads with a cloth or an old toothbrush. Wipe the nozzle after each use and the crust never forms.
Prevention is mostly about aim and timing. Rinse the sink after brushing rather than leaving splatter to dry, and wipe the counter and mirror once a day with a damp cloth -- fresh toothpaste comes off with no effort at all.
Cap the tube and store it upright in a cup rather than lying in a puddle on the counter.
Store toothbrushes so they drip into a container rather than onto the surface, and keep the whole area drier. That is the same principle behind how to clean a soap dish that stays slimy and it runs through cleaning the personal items you use every day.
Source: Marble Institute of America consumer guidance on the care of natural stone surfaces
One safety note about cleaners
Whatever product you choose, use one at a time.
Never mix bleach with vinegar or any acidic bathroom cleaner, which releases chlorine gas. Never mix bleach with ammonia, which is in many glass cleaners, or with rubbing alcohol.
Ventilate the room whenever you use anything stronger than dish soap, and rinse one product away completely before applying another.
For dried toothpaste specifically, none of this is necessary. Warm water and time are the whole method.
FAQ
How do you get dried toothpaste off a bathroom counter?
Lay a warm damp cloth over the spot for two to five minutes so the deposit softens, then wipe it away. If it resists, re-wet it and lift the edge with a plastic card or a fingernail at a shallow angle. Never scrape a countertop with metal or use an abrasive powder.
Will toothpaste damage a quartz countertop?
Toothpaste itself will not, but the wrong removal method will. Quartz is resin-bound and cannot take bleach, abrasives, scouring pads, or high heat, all of which dull the surface permanently. Soften the deposit with a warm damp cloth and wipe it off with mild dish soap and water.
Can you use vinegar to clean toothpaste off a vanity?
Only if the surface is not natural stone. Vinegar permanently etches marble, travertine, and limestone and degrades the sealer on granite. It is fine on glass, mirrors, ceramic tile, and most laminate. For stone, use warm water and a pH-neutral cleaner instead.
How do you clean toothpaste splatter off a mirror?
Wipe each spot with a warm damp cloth first so the deposit softens and lifts, then clean the whole mirror with glass cleaner or a mild vinegar solution on a microfiber cloth and buff dry with a second cloth. Do not let liquid run down onto a stone counter below.
Why does toothpaste dry so hard?
Toothpaste is mostly water holding mild abrasives, thickeners, and binders in suspension. When the water evaporates, that solid material is left compacted on the surface and grips into any texture. Whitening formulas contain more abrasive material and tend to dry harder still.
How do you clean a crusty toothpaste tube cap?
Soak the cap in warm water for a few minutes to soften the deposit, then wipe the threads with a cloth or scrub them with an old toothbrush. Wipe the tube nozzle after each use and the crust will not form in the first place.
Wiping the counter daily keeps it easy. A bathroom that has fallen behind takes a real deep clean. If you would rather hand that off, get a quote or read more about house cleaning services.